A Practical Approach of Continuous Processing to High Energetic Nitration Reactions in Microreactors

  • Panke G
  • Schwalbe T
  • Stirner W
 et al. 
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Continuous processing in microreactors represents a novel way for the safe and expedient conduct of high energetic reactions and potentially hazardous chemistry. Apart from handling benefits (such as minimised problems in the scale-up process), reactions in microreactors proceed under precisely controlled conditions providing improved yields and product quality compared to the batch procedure. In this paper, the potential of this technology is exemplarily determined in the crucial nitration of the pharmaceutically relevant intermediate 1-methyl-3-propyl-1 H-pyrazole-5-carboxylic acid (1). Further fundamental nitration examples demonstrate the unproblematic handling of hazardous H2SO4/HNO3 mixtures for the nitration of 2-methylindole (4) and pyridine-N-oxide (6) or even the explosive acetyl nitrate Ac2O/HNO3 (nitration of toluene, 8) in the continuous reaction mode.

Author-supplied keywords

  • Continuous chemistry
  • Heterocycles
  • Microreaction technology
  • Nitration reactions
  • Pyrazoles

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  • Gerhard Panke

  • Thomas Schwalbe

  • Wolfgang Stirner

  • Shahriyar Taghavi-Moghadam

  • Gregor Wille

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